Cancer treatment using white blood cells.. White blood cells are concentrated in a layer called the buffy coat. We take a sample of white blood cells after separating them from the blood of a person who had the same cancer but recovered from it, and then we inject them into the affected organ of the other person Of course, not just once, but every 20 days for 6 months. We take the sample each time from a different recovered person so that the response is stronger.